{"id":25382,"url":"https://alion.io/job/alex-staff-agency-senior-java-engineer","title":"Senior Java Engineer","company":{"id":6834,"name":"Alex Staff Agency","domain":"alexstaff.agency","url":"https://alion.io/company/alex-staff-agency","size_band":"51-200","is_staffing_agency":true,"employer_type":"agency","is_intermediary":false,"listed_via":null,"ats_vendor":"Workable","truth_index":{"grade":"B","score":75,"open_postings":4,"ghost_share":0,"stale_share":1,"repost_share":0,"time_to_fill_p50_days":34,"computed_at":"2026-10-24T06:02:35Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":null,"work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"posting_text","remote_working_hours":null,"hiring_geo_confidence":"inferred","locations":[],"countries":[],"hiring_countries":["ME","PL","RO","SK","SI"],"hiring_countries_total":5,"salary":null,"salary_estimate":{"min_usd":44000,"max_usd":90000,"period":"year","method":"role_seniority_country_cell","sample_n":8},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Aerospike","optional":false},{"name":"AI Agents","optional":false},{"name":"Apache Kafka","optional":false},{"name":"ClickHouse","optional":false},{"name":"Go","optional":false},{"name":"Java","optional":false},{"name":"LangChain","optional":false},{"name":"LangGraph","optional":false},{"name":"n8n","optional":false},{"name":"React.js","optional":false},{"name":"SLI/SLO/SLA","optional":false},{"name":"Spring Boot","optional":false},{"name":"TypeScript","optional":false},{"name":"JavaScript","optional":true}],"status":"live","first_seen_at":"2026-05-26T00:00:00Z","employer_posted_date":"2026-05-26","last_verified_at":"2026-10-24T10:09:01Z","board_verified":true,"closed_at":null,"days_open":151,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":151},"description":"The position is open for a global, publicly traded AdTech market leader. The company's platforms handle over 1 trillion requests per day, operating within a highly optimized real-time cloud architecture across dozens of servers and processing terabytes of data daily.\nThe engineering team focuses on intense performance optimization, low-latency infrastructure, asynchronous data streaming, and cutting-edge GenAI research and development.\nSalary: upto $5,000 USD / month.\n Format: Full-time. Hybrid (Budva, Montenegro) or 100% Remote globally\nContract Type: B2B Contract \nResponsibilities\nDesign, scale, and maintain real-time advertising bidding systems (DSPs, RTB Exchanges, and SSP platforms).\nOptimize backend services using Java (Spring Boot / WebFlux) and Go (Golang) to meet strict low-latency SLA/SLO targets.\nBuild and manage data-intensive architectures utilizing high-load storage solutions (Aerospike, ClickHouse) and event-driven messaging (Apache Kafka).\nParticipate in R&D initiatives involving GenAI, integrating Agentic AI frameworks (LangChain, LangGraph, N8N) for workflow automation and predictive analytics.\nTake full ownership of features end-to-end, contributing to the frontend layer (React / TypeScript) for internal tools and dashboards when required.\nRequirements\n5+ years of commercial software development experience with Java as the primary language.\nDeep knowledge of the Spring ecosystem (Boot, Data, MVC, Security, Cloud) and strong practical experience with reactive/asynchronous programming (Spring WebFlux / Project Reactor).\nSolid understanding of distributed systems, concurrency, and performance tuning at the JVM level.\nStrong verbal English skills at B2 level or higher, with the ability to explain architectural decisions and collaborate directly with a global engineering team during voice calls.\nLocation outside of the Russian Federation due to contractual and payment restrictions. Candidates from Belarus are eligible only if they possess an active legal entity/IP in Georgia or Europe for international payments.\nCommercial programming experience or strong familiarity with Go (Golang).\nHands-on experience with high-load and Big Data tools including Apache Kafka, ClickHouse, and Aerospike.\nReal-world experience or deep interest in LLMs and AI orchestration tools such as LangChain, LangGraph, or N8N.\nFamiliarity with frontend development using ReactJS and TypeScript.\nBenefits\nOpportunity to work on production infrastructure handling 1 trillion + daily requests.\nWork within a team of senior engineers with direct impact on the platform's architecture.\nChoice between a fully remote schedule or a hybrid format from the office in Budva, Montenegro.\nStable monthly payments in USD via international B2B contracts.","description_format":"text","description_chars":2766,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[{"language":"English","level":"All levels","optional":false}]},"benefits":[],"hiring_locations":[{"name":"Montenegro","iso":"ME","kind":"country"},{"name":"Poland","iso":"PL","kind":"country"},{"name":"Romania","iso":"RO","kind":"country"},{"name":"Slovakia","iso":"SK","kind":"country"},{"name":"Slovenia","iso":"SI","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":[],"lifecycle":[{"event":"open","at":"2026-05-26T00:00:00Z"}],"visa":[],"liveness":{"score":6,"band":"cold","label":"Long shot","p_open":1,"p_active":0.217,"p_room":0.28,"age_days":151,"expected_fill_days":34,"reasons":["conf:0","agency","urgency","win:tail","crowd:"],"computed_at":"2026-10-24T06:02:35Z"},"pay":null,"html_url":"https://alion.io/job/alex-staff-agency-senior-java-engineer","json_url":"https://alion.io/job/alex-staff-agency-senior-java-engineer.json","meta":{"generated_at":"2026-10-24T13:13:58Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":18949,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-25T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":6834},"rest":"https://alion.io/mcp/rest/get_company?id=6834"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Falex-staff-agency-senior-java-engineer"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Falex-staff-agency-senior-java-engineer"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Falex-staff-agency-senior-java-engineer"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/alex-staff-agency-senior-java-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Falex-staff-agency-senior-java-engineer"}]}